Gas pilot valve



April 19, 1938. H. J. LONG.u

GAS PILOT VALVE' Filed March 19, 1937 I4 M, 0u

ATTORNEY.

Patented Apu l19, 1938 UNITED STATES PATENT oFFlci'` Application Marcil19, 1931, serial No. 131,814 l 2 Claims.

This invention relates to a pilot burner of the type adapted to cut'oithe supply of gas to both the main burner and the pilot burner in theevent the ame at the pilot burner tip becomes exa tinguished. y

It is one of the objects of this invention to provide a burner of thistype in which the ow of gas to the pilot burner may be readily anddelicately adjusted while the pilot is in operation. j

It is a further object of the inventior'rto provide a structure which issimple and therefore inexpensive in manufacture yet durable andeconomical in use. l

It is a further object of this invention to pro- N vide a safety pilotofthis type in which the thermostat is not exposed directly to the flameof the burner norto the gas iiowing thereto. To this end the pilotyburner is mounted on and above the thermostat housing and heat from theburner is conducted downwardly thereto by way of an integral metallicstructure, while the gas supply for the pilot is conducted theretoy by apassage separate therefrom. The thermostat device is thereby protectedboth from the direct heat of the flame of the pilotand also fromimpurities in the gas owing to the burner which might otherwise aiectits durability and eiciency.

The above and other objects and features of the invention insofar asthey are not obvious to those skilled in the art, will be fully setforth in the following detailed description taken in conjunction withthe accompanying drawing, in which:

Fig. 1 is a top plan View of `a device constructed in accordance withthe invention; Fig. 2.is a side elevation thereof Fig. 3 is a sectiontaken on line 3 3 of Fig. 1; Fig. 4 is a section taken on line 4-4 ofFig. 1; Fig. 5 is a detail showing a longitudinal section through theburner tip; Fig. 6 is a fragmentary section taken on the line 6-6 oit'`Fig. l;

and Flg. 7 is a detail showing a longitudinal secution through amodified form of burner tip.

Referring to the drawing, reference numeral I is a. casting forming anL-tting the lower branch 2 of which is internally threaded forconnection with a suitable source of gas supply, and the other branch 3of which is internally threaded for connection with a gas burner which,it will be understood; is disposed in close proximity to the pilot. Inalignment with the passage formed by the lower branch 2 of the L is aninternally threaded opening 4 in the upper portion of the casting Iadapted to receive an externally threaded valve plug 5. An annular boss6 of lesser external diameter than the diameter of the threaded portion'of the valve. plug 5 projects downwardly therefrom, and the lower outeredge thereof is seated upon an internal shoulder 1 formed in the.

casting I. The inner lower edge of the annular boss 6 provides a seatfor a valve 8, the stem 9 of which projects upwardly through a centralbore in the plug 5. An externally threaded annular boss I Il projectsupwardly for a short distance from the upper surface of the plug 5 andextends through an opening il inthe lower half I2 of a sheet metalhousing for a disc thermostat I3. A nut I4 on the annular boss I0 isadapted to act through a packing I5 t'o securely clamp the housingportion I 2 to the valve plug 5.. The valve stem 9 has a reduced endportion I6 which is externally threaded andfprojects through a centralopening in the disc. l3 to secure said disc by threaded connecti'on witha nut I'I integral therewith. The disc I3 is clamped between the lowerhousing member I2 and a similar upper housing member i8. The upperhousing member has a'central opening I9 and a pilot burner 45 issupported thereon and attached thereto by means of an internally andexternally threaded bushing 20 which projects upwardly through theopening I9` and is provided with an outwardly extending flange 2| f onthe lower end thereof for contacting the inner surface of the housingmemben. Thisl housing member is clamped between the iiange 2| and thelower end of a burner support member 22, by screwing the bushing 20 intoa longitudinal bore 23 of the member 20 the lower end of which isprovided with internal threads for this purpose. The casting I is alsoprovided with a`lateral bore 24, which opens into the gas inlet passageata point below the valve 8. The outer end of bore 24 is closed bylavalve plug 25, which is screwthreaded lthereinto and which carries avalve 26 having a stem 21 .which projects outwardly v through a bore 2Bin the valve plug. A spring 29, surrounding the outer end of the valvestem, acts upon a push button '30, which is threadedly connected to theouter end of the valve stem to hold the valve 26 against the seat formedin the valve plug and normally close communication between tlie passageformed by the lateral bore 24 and a passage 3l formedin the valve plug,which leads to anupwardly extending passage 32 formed in the casting I.Passage 32 is threaded in its upper lportion to accommodate externalthreads on a heat to the thermostat.

I8 and another `of which is directed toward the pilot burner.

The casting I is also provided with passage 36 which opens into theinterior thereof at a point above the valve `8 and extends angularly toa horizontally extending passage 31 formed in a raised portion 38 on theside of the casting I. The other end of the passage 36 is closed byscrew plug 39 and within the passage covered and protected by the screw39 is an adjusting valve 40 for controlling the flow from the passage 31to an upwardly extending passage 4 I. In the form shown the adjustingvalve 4U is of the type in which rotation of the valve moves a groove inthe side wall thereof into and out of registry with the passage 4I,thereby more or less obstructing the ow therethrough. It will beunderstood that the valve might be of the type in which longitudinalmotion thereof more or less obstructs such passage. A tube 42 extendingpartially into the passage 4I and sealed therewith by pressure plug 43extends outwardly beyond the casting I and is bent to connect at itsopposite end with a passage 44 of a burner member 45. The burner member45 is preferably formed integrally with the support member 22 tofacilitate the conduction of The burner member is provided with anoutwardly flaring flange 46 at one end thereof and the passage 44 isenlarged at this end to accommodate a jet plug 41. The jet plug 41 hasa4 longitudinal passage 48 opening into passage 44 and terminating shortof the end thereof. Jet passages 49 extend angularly from the passage 48andA are directed toward the flange 28.

A modicd form of burner tip such as shown in Fig. 'I may be used whereit is desired that the tip project vertically rather than horizontally.In this view similar reference numerals primed indicate parts similar-to the unprimed reference ignited by the flame projected from thetorch.

The supply of gas to the lighter torch may now be discontinued. As longas the pilot is burning the valve 8 will remain in open position due tothe heat conveyed thereto from the burner 45 through the burner support22 which is integral with the burner. It will be seen that supplying thefuel to the pilot burner in the manner shown rather than through thedisc thermostat I3 and the burner support 22 as in the usualconstructions, permits the provision of a means for adjusting thequantity of gas flowing to the pilot burner from a convenient point atone side of the casting. At the same time the flow of gas through thedisc thermostat is avoided, thus obviating the possibility of corrosionor other injury to this member through such source.,

Though this invention has been described in connection with but a'single embodiment thereof, it will be obvious that other embodimentswithin the scope of the following claims will occur to those skilled inthe art and furthermore, while the device has been shown in itspreferred positioningit will be obvious that it may be disposed in otherpositionings and the use of the terms fabove, below, upper, lower andthe like are used for convenience in the description of the form shownand are not limitations with respect to the positioning of the partsdescribed.

What is claimed is:

1. A gas pilot control comprising a casting forming a valve housinghaving a passage eX- tending therethrough, one end of said passageproviding a connection to a source of supply, a valve plug closing theopposite end of said passage, an annular boss-extending from said valveplug providing a seat, a valve coacting with said seat, means providinga gas outlet connected with the space in said casting above said valve,said boss vhaving lateral openings providing communication with saidspace, a thermostat housing mounted upon said plug,.a thermostat withinsaid thermostat housing in heat conducting relation thereto adapted toactuate said valve, a pilot burner mounted upon and in heat conductingrelation to said thermostat housing, and a tube extending from saidburner externally of said thermostat housing and communicating with thespace above said valve. 4

2. A gas pilot control comprising a casting forming a valve housinghaving a passage extending therethrough, one end of said passageproviding a connection to a source of supply, a valve plug closing theopposite end of said passage, a valve having a stem extending throughsaid plug, a thermostat housing supported upon said plug surrounding theprojecting end of said valve stem, a thermostat in said housing coactingwith said valve stem, a burner support mounted upon said thermostathousing, a pilot burner integral with said burner support, a tubeforming a passage extending from said burner externally of saidthermostat and communicating with the space above said valve, and meansforming a passage for the discharge of the main gas supply from thespace above said valve.

HERBERT J. LONG.

